title: catena-Poly[[bis-(pyridine-κN)zinc]-μ-5-carb-oxy-benzene-1,3-di-carboxyl-ato-κ(2) O (1):O (3)].
abstract: The title one-dimensional coordination polymer, [Zn(C9H4O6)(C5H5N)2] n or [Zn(HBTC)(py)2] n , (I), where BTC is benzene-1,3,5-tricarboxylate and py is pyridine, is a solvent-free polymorph of [Zn(HBTC)(py)2]·2C2H5OH [Yaghi et al. (1997 ▶). Chem. Mater. 9, 1074-1076]. Differences in the spatial arrangements and supra-molecular packing of the [Zn(HBTC)(py)2] n chains in the two structures are described. The chain in (I) extends parallel to [100] and is severely puckered, with a Zn⋯Zn distance of 8.3599 (3) Å and a Zn⋯Zn⋯Zn angle of 107.516 (3)°, as a result of hydrogen-bonding inter-actions of the types O-H⋯O and C-H⋯O. There is no evidence for π-π inter-actions in (I). The differences between the solvent-free and solvent-containing structures can be accounted for by the absence of the ethanol solvent mol-ecule and the use of the converging pair of O atoms in the bis-monodentate bridging HBTC(2-) ligand in (I).
authors.affiliation: Division of Chemistry, School of Science, University of Phayao, Phayao 56000, Thailand.
authors.forename: Bunlawee
authors.initials: B
authors.lastname: Yotnoi
authors.forename: Apinpus
authors.initials: A
authors.lastname: Rujiwatra